#include <common.hpp>
#include <utils.hpp>

#include <gec/utils/hash.hpp>
#include <gec/utils/misc.hpp>
#include <gec/utils/prime.hpp>
#include <gec/utils/static_map.hpp>

#include <random>
#include <unordered_set>
#include <vector>

#include <configured_catch.hpp>

using namespace gec;
using namespace utils;

TEST_CASE("leading_zeros", "[utils][misc]") {
    std::random_device rd;
    auto seed = rd();
    INFO("seed: " << seed);
    std::mt19937 rng(seed);

    using T = uint64_t;

    constexpr size_t hb = utils::type_bits<T>::value - 1;
    std::uniform_int_distribution<> gen;
    std::uniform_int_distribution<> gen_bit(0, hb);

    for (size_t k = 0; k <= hb; ++k) {
        T x = T(1) << k;
        CAPTURE(x);
        REQUIRE(hb - k == count_leading_zeros(x));
        REQUIRE(k == most_significant_bit(x));
    }

    for (int k = 0; k < 1000; ++k) {
        size_t b = gen_bit(rng);
        T r = gen(rng);
        T x = (r >> b) | (T(1) << (hb - b));
        CAPTURE(x);

        REQUIRE(b == count_leading_zeros(x));
        REQUIRE(hb - b == most_significant_bit(x));
    }
}

TEST_CASE("trailing_zeros", "[utils][misc]") {
    std::random_device rd;
    auto seed = rd();
    INFO("seed: " << seed);
    std::mt19937 rng(seed);

    using T = uint64_t;

    constexpr size_t hb = utils::type_bits<T>::value - 1;
    std::uniform_int_distribution<> gen;
    std::uniform_int_distribution<> gen_bit(0, hb);

    for (size_t k = 0; k <= hb; ++k) {
        T x = size_t(1) << k;
        CAPTURE(x);
        REQUIRE(k == count_trailing_zeros(x));
        REQUIRE(k == least_significant_bit(x));
    }

    for (int k = 0; k < 1000; ++k) {
        size_t b = gen_bit(rng);
        T r = gen(rng);
        T x = (r << b) | (T(1) << b);
        CAPTURE(x);

        REQUIRE(b == count_trailing_zeros(x));
        REQUIRE(b == least_significant_bit(x));
    }
}

template <typename Int>
static void test_is_prime(vector<int> &primes, int bound) {
    Int init_x = Int(
        std::numeric_limits<Int>::is_signed ? -primes[primes.size() - 1] : 0);
    for (Int x = init_x; x < 2; ++x) {
        CAPTURE(+x);
        REQUIRE(!is_prime(x));
    }
    REQUIRE(is_prime(2));
    for (auto p1 = primes.cbegin(), p = primes.cbegin() + 1;
         p != primes.end() && (bound < 0 || *p < bound); ++p1, ++p) {
        Int prime(*p);
        for (Int x = Int(*p1 + 1); x < prime; ++x) {
            CAPTURE(+x);
            REQUIRE(!is_prime(x));
        }
        CAPTURE(+prime);
        REQUIRE(is_prime(prime));
    }
}
TEST_CASE("is_prime", "[utils][prime]") {
    vector<int> primes{
        2,    3,    5,    7,    11,   13,   17,   19,   23,   29,   31,   37,
        41,   43,   47,   53,   59,   61,   67,   71,   73,   79,   83,   89,
        97,   101,  103,  107,  109,  113,  127,  131,  137,  139,  149,  151,
        157,  163,  167,  173,  179,  181,  191,  193,  197,  199,  211,  223,
        227,  229,  233,  239,  241,  251,  257,  263,  269,  271,  277,  281,
        283,  293,  307,  311,  313,  317,  331,  337,  347,  349,  353,  359,
        367,  373,  379,  383,  389,  397,  401,  409,  419,  421,  431,  433,
        439,  443,  449,  457,  461,  463,  467,  479,  487,  491,  499,  503,
        509,  521,  523,  541,  547,  557,  563,  569,  571,  577,  587,  593,
        599,  601,  607,  613,  617,  619,  631,  641,  643,  647,  653,  659,
        661,  673,  677,  683,  691,  701,  709,  719,  727,  733,  739,  743,
        751,  757,  761,  769,  773,  787,  797,  809,  811,  821,  823,  827,
        829,  839,  853,  857,  859,  863,  877,  881,  883,  887,  907,  911,
        919,  929,  937,  941,  947,  953,  967,  971,  977,  983,  991,  997,
        1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069,
        1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163,
        1171, 1181, 1187, 1193, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249,
        1259, 1277, 1279, 1283, 1289, 1291, 1297, 1301, 1303, 1307, 1319, 1321,
        1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 1427, 1429, 1433, 1439,
        1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489, 1493, 1499, 1511,
        1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601,
        1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693,
        1697, 1699, 1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783,
        1787, 1789, 1801, 1811, 1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877,
        1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1951, 1973, 1979, 1987,
        1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 2039, 2053, 2063, 2069,
        2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 2141, 2143,
        2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267,
        2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347,
        2351, 2357, 2371, 2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423,
        2437, 2441, 2447, 2459, 2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543,
        2549, 2551, 2557, 2579, 2591, 2593, 2609, 2617, 2621, 2633, 2647, 2657,
        2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693, 2699, 2707, 2711, 2713,
        2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, 2797, 2801,
        2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903,
        2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001, 3011,
        3019, 3023, 3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119,
        3121, 3137, 3163, 3167, 3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221,
        3229, 3251, 3253, 3257, 3259, 3271, 3299, 3301, 3307, 3313, 3319, 3323,
        3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 3389, 3391, 3407, 3413,
        3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 3517, 3527,
        3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607,
        3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697,
        3701, 3709, 3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797,
        3803, 3821, 3823, 3833, 3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907,
        3911, 3917, 3919, 3923, 3929, 3931, 3943, 3947, 3967, 3989, 4001, 4003,
        4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 4073, 4079, 4091, 4093,
        4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 4201, 4211,
        4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273, 4283,
        4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409,
        4421, 4423, 4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513,
        4517, 4519, 4523, 4547, 4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621,
        4637, 4639, 4643, 4649, 4651, 4657, 4663, 4673, 4679, 4691, 4703, 4721,
        4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, 4793, 4799, 4801, 4813,
        4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, 4933, 4937,
        4943, 4951, 4957, 4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011,
        5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113,
        5119, 5147, 5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233,
        5237, 5261, 5273, 5279, 5281, 5297, 5303, 5309, 5323, 5333, 5347, 5351,
        5381, 5387, 5393, 5399, 5407, 5413, 5417, 5419, 5431, 5437, 5441, 5443,
        5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 5519, 5521, 5527, 5531,
        5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, 5651, 5653,
        5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743,
        5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849,
        5851, 5857, 5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939,
        5953, 5981, 5987, 6007, 6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073,
        6079, 6089, 6091, 6101, 6113, 6121, 6131, 6133, 6143, 6151, 6163, 6173,
        6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, 6257, 6263, 6269, 6271,
        6277, 6287, 6299, 6301, 6311, 6317, 6323, 6329, 6337, 6343, 6353, 6359,
        6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473,
        6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581,
        6599, 6607, 6619, 6637, 6653, 6659, 6661, 6673, 6679, 6689, 6691, 6701,
        6703, 6709, 6719, 6733, 6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803,
        6823, 6827, 6829, 6833, 6841, 6857, 6863, 6869, 6871, 6883, 6899, 6907,
        6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 6977, 6983, 6991, 6997,
        7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 7109, 7121,
        7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229,
        7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349,
        7351, 7369, 7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487,
        7489, 7499, 7507, 7517, 7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561,
        7573, 7577, 7583, 7589, 7591, 7603, 7607, 7621, 7639, 7643, 7649, 7669,
        7673, 7681, 7687, 7691, 7699, 7703, 7717, 7723, 7727, 7741, 7753, 7757,
        7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, 7877, 7879,
        7883, 7901, 7907, 7919, 7927, 7933, 7937, 7949, 7951, 7963, 7993, 8009,
        8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111,
        8117, 8123, 8147, 8161, 8167, 8171, 8179, 8191, 8209, 8219, 8221, 8231,
        8233, 8237, 8243, 8263, 8269, 8273, 8287, 8291, 8293, 8297, 8311, 8317,
        8329, 8353, 8363, 8369, 8377, 8387, 8389, 8419, 8423, 8429, 8431, 8443,
        8447, 8461, 8467, 8501, 8513, 8521, 8527, 8537, 8539, 8543, 8563, 8573,
        8581, 8597, 8599, 8609, 8623, 8627, 8629, 8641, 8647, 8663, 8669, 8677,
        8681, 8689, 8693, 8699, 8707, 8713, 8719, 8731, 8737, 8741, 8747, 8753,
        8761, 8779, 8783, 8803, 8807, 8819, 8821, 8831, 8837, 8839, 8849, 8861,
        8863, 8867, 8887, 8893, 8923, 8929, 8933, 8941, 8951, 8963, 8969, 8971,
        8999, 9001, 9007, 9011, 9013, 9029, 9041, 9043, 9049, 9059, 9067, 9091,
        9103, 9109, 9127, 9133, 9137, 9151, 9157, 9161, 9173, 9181, 9187, 9199,
        9203, 9209, 9221, 9227, 9239, 9241, 9257, 9277, 9281, 9283, 9293, 9311,
        9319, 9323, 9337, 9341, 9343, 9349, 9371, 9377, 9391, 9397, 9403, 9413,
        9419, 9421, 9431, 9433, 9437, 9439, 9461, 9463, 9467, 9473, 9479, 9491,
        9497, 9511, 9521, 9533, 9539, 9547, 9551, 9587, 9601, 9613, 9619, 9623,
        9629, 9631, 9643, 9649, 9661, 9677, 9679, 9689, 9697, 9719, 9721, 9733,
        9739, 9743, 9749, 9767, 9769, 9781, 9787, 9791, 9803, 9811, 9817, 9829,
        9833, 9839, 9851, 9857, 9859, 9871, 9883, 9887, 9901, 9907, 9923, 9929,
        9931, 9941, 9949, 9967, 9973, 10007};

#define test_helper(T, bound)                                                  \
    do {                                                                       \
        INFO(#T);                                                              \
        test_is_prime<T>(primes, bound);                                       \
    } while (0)

    test_helper(int8_t, 0x7F);
    test_helper(uint8_t, 0xFF);
    test_helper(int16_t, -1);
    test_helper(uint16_t, -1);
    test_helper(int32_t, -1);
    test_helper(uint32_t, -1);
    test_helper(int64_t, -1);
    test_helper(uint64_t, -1);

#undef test_helper
}

TEST_CASE("CHD static map", "[utils][static map][chd]") {
    std::random_device rd;
    auto seed = rd();
    CAPTURE(seed);
    std::mt19937 rng(seed);

    std::uniform_int_distribution<> gen;

    size_t M = 10000;

    gec::hash::Hash<int> hasher;

    CHD<> phf(nullptr, M);
    vector<size_t> buckets(phf.B);
    phf.buckets = buckets.data();

    vector<int> data(phf.N);
    vector<size_t> hashes(phf.N);
    for (size_t k = 0; k < M - 1; ++k) {
        data[k] = gen(rng);
        hashes[k] = hasher(data[k]);
    }
    // introduce duplication manually
    data[M - 1] = data[0];
    hashes[M - 1] = hashes[0];

    size_t placeholder = phf.fill_placeholder(hashes.data());
    CAPTURE(placeholder);
    auto duplicates = phf.build(hashes.data());

    REQUIRE(duplicates.size() > 0);
    for (auto &dup : duplicates) {
        CAPTURE(dup.first, dup.second);
        REQUIRE(hashes[dup.first] == hashes[dup.second]);
    }

    phf.rearrange(hashes.data(), placeholder);

    for (size_t k = 0; k < M; ++k) {
        auto expected_hash = hasher(data[k]);
        auto idx = phf.get(expected_hash);
        auto hash = hashes[idx];
        CAPTURE(k, data[k], idx);
        REQUIRE(expected_hash == hash);
    }
}
